Zaha Hadid Architects have made a fresh pitch on behalf of Ms. Hadid’s design for the 2020 Tokyo Olympic stadium, with a 23-minute video presentation and a 91-page report. Prime Minister Shinzo Abe last month scrapped the design as too expensive.

Ms. Hadid had criticized that decision, saying it wouldn’t solve the cost problem. On Tuesday, her firm said her design could be tweaked to lower costs. It blamed the rising price tag on local construction fees and suggested introducing greater competition among contractors.